Oh,
I'd say if at all possible DO BOTH! They are both 1st class organizations and your son will see results because of it. My son attended Team One in Tempe and got interest from schools who never would have contacted him w/out his attending. The only PG my son has been able to make was Jupiter, which I regret. (Not Jupiter, but not being able to attend another event)
If you can only do one, maybe others will be able to add their perspective.
Good luck!
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"People ask me what I do in winter when there's no baseball. I'll tell you what I do. I stare out the window and wait for spring." Rogers Hornsby, Hall of Famer